There are lot of freelancing option to earn moey online with digital marketing skills. You can try STEEMGIGS, which is a freelancing site built on top of steem.
The real deal is to get customers, they will search for you if you show them your skills, but still you will need customers to show off your skills. Its always difficult to take the first step in any field, but try marketing yourself to people and catch some customers, satisfy them al they will drive traffic to you.
Good Luck.